Q: I have a 2010 ford mustang v6 4.0 and got engine code p0172. Just want to know what the issue is?

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On my 2010 ford mustang v6 4.0l i have aftermarket header and exhaust. I got engine code p0172. Would like to know what could cause this

My car has 69000 miles.
My car has an automatic transmission.

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